JP2002295565A - Damping valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable damping characteristics to be set freely and simply. SOLUTION: Valve body 10 is assembled movably in a valve main body 1 and this valve body 10 forms a valve 11 which slides in a pressure port. A throttle passageway 12 is formed in this valve 11 to flow out a fluid to have a constitution that a pressure fluid in a pressure port side is backed to a tank side through an outflow passageway formed in the throttle passageway and the valve main body by the movement of the throttle passageway formed in the valve to the inside of valve main body. This movement changes the valve 11 to a hollowed cylinder and the valve of this hollowed cylinder is equipped with a plural number of throttle passageway which passes through the radius direction of the valve and forms the throttle passageway 12 continuous to an axial direction in a circumference direction and also has different end positions in the end of the throttle passage, i.e., the end of the outflow direction passing through the throttle passageway.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping valve most suitable for, for example, a seismic isolation or vibration control device.

[0002]

2. Description of the Related Art A conventional damping valve shown in FIGS. 4 and 5 has a pressure port 2 formed at one end of a valve body 1 and a plug having an outlet port 3 formed at an end opposite to the pressure port 2. 4 is blocking it. The valve body 5 is incorporated in the valve body 1 as described above. The valve body 5 has a cylindrical valve portion 6 formed at one end and a spring guide 7 formed at the other end. ing. A spring 8 is provided between the spring guide 7 and the plug 4 of the valve pair.
Is interposed.

[0003] The cylindrical valve portion 6 is formed with a pair of throttle passages 9 formed of elongated grooves along the axis thereof. The distal end of the throttle passage 9, that is, the distal end in the outflow direction of the fluid passing through the throttle passage 9 is formed in an arc, and this arc portion is used as a control unit 9 a.

In the damping valve described above, if the pressure in the pressure port 2 does not exceed a set pressure determined by the spring force of the spring 8, the entire throttle passage 9 is located in the pressure port 2. In other words, the communication between the pressure port 2 and the outflow port 3 is kept off by the valve element 5.

When the pressure in the pressure port 2 exceeds the set pressure from the above state, the valve element 5 moves against the spring force of the spring 8, and the control section 9a of the throttle passage 9 is moved to the inside of the valve body 1. To open. At this time, the damping force exerted according to the opening degree of the control unit 9a, in other words, according to the amount of movement of the valve body 5, is controlled. The control unit 9a
Is completely opened, the damping force is controlled to be substantially constant by the maximum opening area of the groove.

[0006]

In the above-described conventional damping valve, since the control characteristic of the damping force is determined by the arc-shaped control section 9a, the control characteristic inevitably becomes one pattern. In addition, since the degree of opening changes greatly with respect to the movement of the valve element, there is a disadvantage that desired damping characteristics cannot be obtained. However, seismic isolation or seismic control systems require that the control characteristics be balanced in accordance with the characteristics of the building, but conventional valves cannot easily meet such demands. Was. An object of the present invention is to provide a damping valve that can easily realize various characteristics according to the purpose of use.

[0007]

According to the present invention, a valve body is movably incorporated in a valve body, and the valve body includes
A valve portion that slides in the pressure port is formed, and a throttle passage that allows fluid to flow out is formed in the valve portion, and the throttle body formed by moving the valve body faces the valve body. It is assumed that the damping valve has a structure in which the pressure fluid on the pressure port side is returned to the tank side via the throttle passage and the outflow passage formed in the valve body.

The first aspect of the present invention is based on the premise that the above-described damping valve is used. The first aspect of the present invention is to make the valve portion hollow and cylindrical, and to penetrate the hollow cylindrical valve portion in the radial direction and in the axial direction. The present invention is characterized in that a plurality of throttle passages are formed in the circumferential direction, and the end of the throttle passage, that is, the position of the front end in the outflow direction of the fluid passing through the throttle passage is different. In a second invention, a throttle passage is
A third aspect of the invention, which is characterized in that the slit is formed as a continuous slit in the axial direction, is characterized in that the throttle passage is formed of a plurality of holes that are continuous in the axial direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIGS. 1 to 3 is different from the conventional one in the configuration of the valve portion of the valve body, and the other parts are the same as the conventional one. Therefore, the detailed description of the same configuration as the conventional one is omitted, and the same reference numerals are used for the same components. Valve body 10 of this embodiment
Has a cylindrical valve portion 11 as shown in FIG. That is, the valve portion 11 is hollow.

The cylindrical valve portion 11 hollowed as described above.
A throttle passage 12 formed of a slit is formed, and the slit 12 penetrates in the radial direction of the valve portion 11 and is continuous in the axial direction. A plurality of the throttle passages 12 formed of the slits are formed in the circumferential direction, and the position of the distal end of the throttle passage 12, that is, the position of the distal end in the outflow direction of the fluid passing through the throttle passage 12 is different for each throttle passage 12. I have. For example, as shown in FIG. 3, the lengths of the throttle passages 12 are L1, L2, and L3.
The tip is made to project most forward.

By the above, the valve body 10
Is moved against the spring 8, first a throttle passage of length L1 opens in the valve body 1, and then
The throttle passage having the length L2 is opened, and finally, the throttle passage having the length L3 is opened.

Next, the operation of this embodiment will be described. First, when the pressure in the pressure port 2 exceeds the set pressure, the valve body 11 moves against the spring 8. If the valve element 11 moves, the plurality of throttle passages 12 will be opened at different timings as described above. Since the plurality of aperture passages 12 are opened at shifted timings as described above, the opening timing can be freely set by adjusting the length L. Therefore, the damping characteristics can be freely set according to various buildings.

By forming the throttle passage 12 with a slit, the width and length of the throttle passage 12 can be precisely processed by, for example, laser processing, and a desired damping force can be obtained. In addition, the throttle passage of the present invention may have a plurality of small holes continuous in the axial direction instead of the slit. However, it is better to make a slit
As described above, there is an advantage that the processing can be performed accurately.

[0014]

According to the damping valves of the first and third aspects of the present invention, the damping characteristics can be set freely and easily. According to the second aspect of the invention, machining of the throttle passage is accurate and simple.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is a sectional view of a valve section.

FIG. 3 is an enlarged view of a valve section.

FIG. 4 is a sectional view of a conventional damping valve.

FIG. 5 is a sectional view of a conventional valve section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Pressure port 10 Valve body 11 Valve part 12 Throttle passage

Continued on the front page F term (reference) 3J048 AA06 BE01 BE03 CB21 EA38 3J069 AA09 AA34 AA69 EE01 EE62

Claims (3)

[Claims] 1. A valve body is movably incorporated into a valve body, and a valve portion that slides in a pressure port is formed in the valve body, and a throttle passage through which a fluid flows out is formed in the valve portion. When the valve element moves and the throttle passage formed in the valve portion faces the valve body, the pressure fluid on the pressure port side is returned to the tank side via the throttle passage and the outflow passage formed in the valve body. In the damping valve having the configuration described above, the valve portion is formed into a hollow cylindrical shape, and the hollow cylindrical valve portion is penetrated in the radial direction,
And forming a throttle passage continuous in the axial direction in the circumferential direction,
In addition, a damping valve having a plurality of throttle passages having different positions at the tip of the throttle passage, that is, the tip of the fluid flowing through the throttle passage in the outflow direction. 2. The damping valve according to claim 1, wherein the throttle passage is formed as a slit continuous in the axial direction. 3. The damping valve according to claim 1, wherein the throttle passage is formed by a plurality of small holes continuous in the axial direction.